Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfa980b92e52f35…

MALICIOUS

PDF

77.5 KB Created: 2021-02-15 13:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40defdad85470b5e305e39006fd590de SHA-1: dd0550c0b832622e9112fe260055e1a7b939f49c SHA-256: 6cfa980b92e52f35ff7760e48682c0432d4a0dd4fb96931af445193281696a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/123?utm_term=kant+critique+of+practical+reason+cambridge PDF link annotation
    • http://ideaita.fun/descargar_libro_de_parasitologia_veterinaria_quirozif4o5.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/iT77gje/nuweribogeme.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/DYhfiaN/fishing_bait_life_hacks.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/Shbo11J/cancel_my_etisalat_account.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/bozubajaviwotekebuje.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/cgeibij/military_crowd_control_sound_weapon.pdfIn PDF document text
    • http://bigpleasure.ru/rusojixutirobagefitopij1wjg6.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/e5b2803624.pdfIn PDF document text
    • http://busibear.com/15259041968s8qvj.pdfIn PDF document text
    • https://cdn.sqhk.co/vigefifobot/ek9tjdW/candy_movie_1968_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hbhgjgg/vifagajilog.pdfIn PDF document text
    • http://ejinaya.com/468433978337f41k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/cmsis-_rtos_rtx_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/abcd_2_chunar_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/2010_to_2015_bollywood_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/88859570389.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/93248646545.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/dasuvaledaxadagimawok.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/bareilly_ki_barfi_film_video_song.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5712 bytes
SHA-256: 9c17fa1ecceb539f056eb1220608b7463fa3a788aec641ae1869f851c73c0b30
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10440 bytes
SHA-256: 7419ce2cc0debce23cf6bd8c0807b51b2254f76844a759e80fd6d945f7c32494

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